Glass-working machine.



No. 768,589. PATENTED AUG.30, 1904. I. W. COLBURN. GLASS WORKINGMAGHINE.

APPLIUATION FILED un. a. 190s. No MODEL. 7 SHEETS-SHEET 1.

No. 768,589. PATENTED AUG. 30, 1904. n

I. W. COLBURN.

GLASS WORKING MACHINE. APPLIUATION FILED MAB. s, 1903. No MODEL. 7 SHEETS-SHEET 2.

` Q l m WITNESSES b INVENTOR;

ATTORNEY.

- PATENTED'AUG. 30, 1904.

I. W. GOLBURN. GLASS WORKING MACHINE.

APPLIOATION' FILED MAB. 3| 1903.

v snnmssnrrm a.

No MODEL.

INVENTOR; I L

BY@ 'ATTORNEY wlTNEssEs. 2%, J. MM

PATEN'TED AUG.- 30, 1904,

'1 SHEETS-SHEET 4.

INVENTOR: WW'M BY AT'OHNEM I. W. GOLBURN. GLASS WORKING MACHINE.

APPLICATION FILED LIAR. 3. 1903.

N0 MODEL.

WIT-NESS wlw@ PATBNTBD AUG. so, 1904.

I. W. GQLBURN. GLASS WORKING MACHINE.

APPLICATION FILED MAR. s. 190s.

7 SHEETS-SHEET 5.

N0 MODEL.

f1 NN INVENTOR:

W|TNESSE5- AT TOR N EY.

PATENTED AUG. 30,1o4,

' I. W. COLBURN.

GLASS. WORKING MACHINE.

l SHEETS-SHEET -6.

APPLICATION FILED MAAR. 3. 1903.

N0 MODEL f INVENTOR.' .'J 8%.? MMM;

ATTORNEY.

y .Q N www WITNESSES PATENTED AUG. 30, 1904.

APPLICATION FILED MAR. 3. 1903.

7 SHEETS-SHEET 7.

N0 MODEL.

0 mm. .Y www@ Nu, 7mm E O Y V im. u N 91%@ md mi ,l ,JWM A w vv QQNG m.m.\| nu Q WITNESSES.

AUNITED 'STATES Patented August 3o, 19o/i..

IRVING W. COLBURN, OF FRANKLIN, PENNSYLVANIA.

GLASS-WORKING. MACHINE.

SPECIFICATION forming' part of 'Letters Patent No. '768.589, dated August 30, 19041.

Application filed March 3, 1903.

To a/ZZ whom it may concern:

.Be lit known that I, IRvING W. CoLBURN, a citizen of the United States, residing' at Franklin in the county of Venan go and State of Pennsylvania, have invented certain new and useful Improvements in Glass-VVorking Machines, of which the following is a specification.

My invention relates to a novel means or apparatus for producing articles of glass.

The object is to furnish a machine by the aidof which cylinders of large size can be made adapted to be cracked on at the ends where the cylinder terminates, slit open, and flattened out into sheets suitable for windowglass, The machine is also adapted for the formation of cylindrical and spheroidal vessels offlarge size by suitable manipulation.-

In the drawings forming a part of this specication, Figure 1 is a front elevation of the machine. Fig. 2 is a plan view. Fig. 3 is a front elevation at a certain stage of operation, showing the slicker 103 in place. Fig. t is a front elevation of a part of the machine at a filled and monthclosed and locked. Fig. 7 is a sectional view on line g g, Fig. 2, showing mold open and modeling-marver 10 in place beneath the glass casting. Fig. 8 is a longitudinal sectional view through the glass casting and modeling-block on line it it, Fig. 2. Fig. 9 illustrates the air-pressure-regulating Valve in ,verticalsection Fig. 10 is a hori- Zontal section of the air-pressure-regulating valve on line d d of Fig. 9, showing the valve closed. Fig. 11 is a horizontal section of the air-pressure-regulating valve on line d CZ of Fig.. 9, showing the valve open. Fig. 12 'is a vertical sectional view of the head-stock, holding-head, and movable plug and revoluble spindle, illustrating how theholdingrhead may be detached. Fig. 13 is a projection of the exhaust-port of the air-pressure-regulating valve kdeveloped on a plane. Fig. 14. is a sectional view of the tubular plunger. Fig.`

Serial No. 145,879. (No model.)

15 is a transverse sectional view ofthe plunger on line ff of'Fig. 14. Fig. 16 is a plan view of the outer end of the plunger. 17 is a longitudinal sectional view` on line t 7L, Fig. 2, illustrating'the details of the holdingheads, neck-forming-flanged washers,airplug, and hollow plunger. Fig. 18 is an end view, partly in transverse section, on line yy, Fig. 3'. Fig. 19 is an end elevation showing sprocket and driving chain connecting rotary shafts. Fig. 2() illustrates the mold-clamp 133, Fig. 1. i Referring to the drawings, 1 is the frame of the machine, provided with ways 11, on which traverses the tail-stock 2. On said frame is mounted the screw 13 in bearings L19 50, having secured thereon the crank 14, by which it is operated. Said screw is in engagement With tail-stock 2 by means ofa nut 14:0 integral therewith, which enables the tail-stock to be moved back and forth on the ways 11.

v 16 is a pedestal or upright bearing secured or integrally formed on frame 1, on which the members of the sectional mold are pivoted by meansof arms 17 17 18 18 and shaft 21.l

The mold is divided, preferably, into two Amembers 6 and 7, pivotallyopeningand closing, as shown-in Fig. 5, provided with handles 131 132, by which said members are operated.. 133 is a clamp for retaining the members in secure position against pressure when closed. It embraces the handles 131 132 when in position. The mold may be of any suitable shape interiorly, the one shown being ellipsoidal, and has a'monthor aperture 30 when closed provided for iilling purposes and a lid,V or cover 8, fitting the mouth 30 to close' the aperture,'pivotally secured to one of the mold members. handle 23 and a locking-lever 24, the latter pivoted to the lid and engaging by a hook 9 i with a projecting lug 22 on the opposite mold member to lock the aperture and secure the lid against displacement by internal pressure. The mold is preferably madek of metal of highly-polished surface on the'interior and is open at both ends when closed to admit theholding-heads, hereinafter described whichk project into the mold.

25 and 26 are the holding-heads, Figs. 2, 3,

Said lid is provided With a I OO 4, 8, 17. They are tubular and roughened on their surfaces to cause them to adhere to the plastic glass. v

31 35 are rotatory spindles to which said holding-heads 26 25 are detaehably secured, respectively, by means of square lugs 41 42, inserted into the respective sockets 32 36 in the said spindles. Said spindles are in axial alinement and are revoluble in unison with their holding-heads by means hereinafter described. `Spindle 31 is revolubly mounted in bearing 37 on a stationary headstock 5, afrixed to the main frame of the machine. Spindle 35 is revolubly mounted in bearing 45 on movable-tail-stock 2. On spindle 31 is secured sprocket 43, which is connected by chain-gearing 39 with sprockets 44 and 40. Sprocket 44 is an idler and receives which motion is communicated to the other 12, on the latter of which sprocket 40 is mounted. Said shaft 12 is mounted on frame 1 in bearings 28 27, and on it by means of spline 141 is splined the longitudinally-movable sprocket 52, revolubly mounted on movable tail-stock 2 in bearing 48 and held in place by collar 29. In said tail-stock is also mounted on rotatory spindle 35 in bearings 45 46 the sprocket 47, connected with sprocket 52 by chain-gearing 51. These sprockets being in the same ratio of gear with sprocket 43 40, it follows that spindles 35 31 and their respective holding-heads rotate in unison, and they may be rotated in either direction at will by means of crank 38.

The hollow spindle 31 has splined within it, so as to rotate with it and be longitudinally movable therein, the plug 33, capable of being projected into the hollow holding-head 26 for the purpose of stopping the aperture in the end thereof. It also serves to conveyair to the interior of the plastic casting by means of the passage 73. A collar 53 serves as a stop, engaged by a locking device 54, to hold the-plug to its place. On the outer extremity of plug 33 is revolubly fitted the sleeve 57, held by cap 58 and provided with handles 55, by which the plug can be thrust into place or retracted. By means of this sleeve communication is established between the air-pas- .sage 73 and the air-conveying tube 127 through T-coupling 62 and nipple 61, Fig.

19, in a manner identical with that illusmounted in rotatory spindle 35, is also hollow and contains a tubular plunger 34, smooth and polished on its exterior and having a terminal aperture 142 smaller than the general bore 65 of the plunger. A movable rod 66 is said cap-piece 67. nally slotted at 70, and into this slot projects located centrally within the plunger, the end of which lits said aperture 142 and stops it when in the position shown in Fig. 14. The outer extremity of the rod 66 passes through cap 67 on the end of the plunger and is fastened to movable end piece 68, sleeved into Said end piece is diagoa pin 69, secured on cap-piece 67, so that by a turning movement of end piece 68 the rod 66 is pushed into or drawn out of aperture 142 and at the same time locked in position. On plunger 34 is a revoluble sleeve 71, held in place by screw-cap 67, channeled at 60 opposite the perforations 59 in the rotatory plnnger for the admission of air thereto, Figs. 14, 15. The air under pressure comes to sleeve 71 through nipple 139 and T-coupling 138 motion by means of crank 38, secured to it, l

ble tube 129. sprocket and thence to spindle 31 and shaft from a source of compressed air through iiexi- A rod 81, affixed to tail-stock 2. passes through eye 19 on the T-coupling, and thereby prevents the sleeve 71 from rotating with the plunger, while permitting longitudinal movement. Handles 72 are provided on the sleeve, by which the plunger 34 can be moved lengthwise indepemlently of the rotatory spindle 35 and holding-head Mounted on movable support 4, traversing on ways 82 and in bearings 77, is the neckdrawing fianged washer 76, with functions to be hereinafter described. lt is made, preferably, of metal polished on its inner face, is free to rotate in its bearing, and is held in place by collar 80. Said movable support 4 is traversed on ways 82 by means of a gearwheel 85, Fig. 5, intermeshing with a rack 87, formed on the under side of support 4 and operated by crank 83 on shaft 84, ailixed to said gear-wheel and borne by a bearing in ways 82. On the side opposite is a corresponding movable support 3. traversing on ways 11 by means of a gear-wheel 92, inter-meshing with rack 94, supported on shaft 93, borne in apron 90 on movable support 3 and actuated by crank 91 on said shaft. Said movable support carries in bearings 79 the rotatory flanged neckdrawing washer 78, similar in construction and function to lianged washer 76 and held in place in its bearings by collar 88. These neckdrawing washers can be traversed back and forth at will by the means described. On support 3 is a pin 97, formed for engagement by a hook 95, pivoted on tail-stock 2, so that movable support 3 may travel backward with the tail-stock when said hook and pin are in engagement. 'l` he purpose of theneck-d rawing flanged washers is to form a neck of glass on each end of the glass article extending between the holding-heads and the article proper at which the latter can be cracked oli and released frein the holding-heads and removed from the machine.

10 is a marvering-tool for smoothing. shaping, and modeling the plastic article in proeess of formation. lt has a handle 98 pass- TOO ving free] y through and turningin a trunnionblock 99, the latter Ypivoted in the forky of con? necting-piece 100, which is itself pivoted to a Ybracket-arm 101, fixed on frame 1, thuspermi'tting a triple movement to the marvernamely, a back-and-forth motion, an up-anddown motion, and a turning motion.' On the opposite side of frame 1 is' a slicker 103` made of any suitable material, attached to handle 104, the latter pivoted to guide-blocks 105,

which are movably carried on a longitudinal shaft 1.07, aHixed to the main frame by brackets 108. The blocks are also provided with V-shaped grooves, by which they rest on and are traversable on the Ways 11. There is a hook 109,'also pivoted on shaft 107, so placed as to engage with a pin on'handle 104 and keep theslicker 103 from "falling down when in position Fig. 18. vThe slicker'4 can :be manipulated by handle 104 and 'run back and forth on Ways 11 and shaft 107 with any required degree of -pressure on the plastic article.

I Will now describe the air supplying and regulating apparatus.

111, Figs. 1,2, and 9, is an air-regulating valve so constructed asto control both the air-pressure and the air volume admit't'edto the'article under 'formation by a single movement.' It is mounted on a supplyep'ipe 117, i leading from a source of air under compressi'on, and consists of a turn-plug'113 in a conica'lca'sing 116, held in seat by a'spring` 114and cap115 and manipulated' by handle- 112. The air reaches chamber 118 and passes thencetolport 11.9`and port 120. Y In the lat-` ter port it divides, one portion passing through port 121 to 'the atmosphere and the other porj tion passing Iby nipple 122 to the pipe 123,-

Figjl. rlhe port 121 is made'oftapering ap'- `erture, as displayed on a plane in Fig. 13, so"

that as the'plug116 is moved in the direction 'of the arrow on Fig.10 at first the maximum of discharge tothe external air occurs and the Y pressure beyond nipple 122 is at minimum. As'

the plugcontinues to turn the aperture 121 contracts and more pressure is utilized'until finally the entire volume or" discharge i's'sent at maxi.-

mum` pressure through the nipple'122. From said-nipple the air-current passesV byv pipe 123 through check-valve124 to T-coupling 125, Where the stream divides, one portion going by pipe 126 'and liexible tube 127 to air-plug 33 for delivery I through holding-head 26 and. the

other portion going bypipe`128 andv flexiblei tube-129 to'air-passage 65 inplunger 34 and thence through holding-head'25 to the interior ofthe plastic article under formation. 'The air thus iinds'access to the 'casting under treat` ment from bothsidesat ence, or either side alone, or neither at `Wi'll,'accordingly as cut-'01T valves 136 and 137 in pipes 126 and 128 Vare 'manipulated'.

7124 is acheCk-valvel to hold the air in thel plastic 'article as delivered. A water-supply pipe 75 is also provided, `controlled .by valve 15 'and terminating in 'perforated 'sprinkler 74 for the purpose of keeping the slicker Wet and cool between operations.

Operation: Taking the machine at rest, with the parts in the'position shown in Fig. 1, the

mold members having been previously heated to the Aproper temperature, so as not to 'chill the plastic charge on the one hand or be liable to adhere to it on thefother, the clamp 133 -is placedl in position for the purpose of' holding the mold securely closed in spite of internal pressure. vThe'holding-heads project Within the mo'ld at each end, vplug 33 being in posi-V ltiontoA stop the aperture in holding-head 26 and securely locked. Theplun'ger 34 is in lretracted position Within thevmouth of holding-head 25 withits terminal aperture closed by rod 66.v as in Fig. 14. The filling-aperture' lis open and the mold-lid isthrown back, as in" Figs`.'1 andv 5. closed against the passage of air. IThe sup- -ports 3 and 4 of the neck-drawing apparatus Air-regulating valve 111 is' are drawn back'in'the position shown in Figs.

1' and 2 and hook 95 is closedover pin 97.

Marver' 10 is4 in the position sh'oWnin' Fig. 6.' The slicker 103 isin "the position Ashovvn in dotted lines in Fig. 1'8. Molten glass vis noW brought 'tothe machine by anyV or' the ap'plifl massxfs'o as to bring the same into intimate contact Withall parts of the inner surface of IIO the mold, causing it to take the exact`fform` thereof and to adh'ere still more closelyr to thel roughened holding-heads. The collars 134; and '135 on` the"holdingheads, which fit the open ends ot-theq mold, prevent the fplas'tic glass from- `fiowing out' underpressure and' form fsto'ps-'by which to 'exert and` hold the pressure applied.l `As soonas the 'plasticA charge is'sufii'cently set the ymcild-cover vis unlocked and lifted, the clamp is rer`no ved,`andr the mold members are opened, takin'gthepoi" sition lshovvn in'Fig. 7. Theholding-'h'eads are now started into rotation by means or` crank 38, carrying the plastic mass With them. 1 The marvering-tool `10vfor smoothing', shaping,and marvering" the rotating glassA may noW be' brought int'o` operation, hav'ingfbeen "lpref': vi'ouslyfbro'ught' to a suitable temperaturefor the 'purpose and been'suitably treated',.and forv properly marver'ing theglass at this vstage the rotary motion may be retarded, accelerated, or reversed in direction, as the work may seem to require. At the proper time during the marvering operation or just after its completion the polished plunger 34 is advanced into and through the plastic mass, completely penetrating the same axially and pushing plug 33, which is now unlocked, backward out of its position, closing the aperture of hold- 'ing-head 26 to the position shown in Fig. 17. Plunger 34 is now withdrawn to the position shown in Fig. 17, rod 66 is withdrawn from aperture 142 in plunger 34, and thus two airpassages to the interior of the plastic mass are provided by the opening of valves 136 and 137. Air is now admitted to the plastic charge by manipulating air-regulating valve 111 at any required degree of pressure, and it can be admitted at either end or both ends in any desired quantity by proper management of said valves 136 and 137. After the marvering operation has been suflciently conducted the block 10 is removed out of the way to its former position. The regulated expansive force of the admitted air gradually brings the rotating mass to the desired size and shape, and the tail-stock 2 is moved back during the operation to draw and'stretch the forming article until it assumes shape somewhat as shown in Fig. 3. At a suitable time during these operations the neck-drawing appliances can be brought into play by unhooking hook 95 and advancing lianged washer 78 to thepo- Sition shown in Fig. 4 by means of crank 90 and by advancing lianged washer 76 to the position shown in Fig. 4 by means of crank 83. `A neck is thus formed on each end of the rot'atingplastic mass surrounding the end of each holding-head, extending a suitable distance between the latter and the linished article. rl`hese necks aid in the removal of the completed article from the holding-heads by affording a narrow place where they can be readily cracked off. Before vthe forming operation is completed the slicker 103 is brought into action, having been previously kept cool and moist by the means for watersprinkling shown in Fig. 18 and suitably prepared by a treatment with paste or other appropriate means of lubrication adapted to the conditions, so as not to scratch, mar, or otherwise injure the delicate surface of the glass under manipulation. It is brought into the position shown in Fig. 18 and is kept moving back and forth lengthwise of the machine with any desired degree of pressure continuously during the rest of the blowing operation until the glass object reaches the desired size. The manipulation by the slicker usefully regulates the diameter of the glass cylinder and also determines its thickness and form, enabling the diametral enlargement to be stopped at any point. V

l claim and desire to secure by Letters Patent- 1. A mold having open ends, and a lillingaperture, means for closing said ends and lilling-aperture, means for locking said mold and aperture when the mold is charged with plastic glass, and means for applying cndwise pressure to the charge in the mold when lilled.

2. A divided mold having open ends, means for opening, closing and locking the mold, a filling-aperture for the mold, a separate means for closing and locking said aperture, means for closing said ends, and means for exerting endwise pressure upon the plastic charge in the mold.

3. A divided mold open at the ends, two holding-heads in axial alinement projecting` into said mold at the open ends, means for charging said mold with molten or plastic glass, means for closing and locking said mold against internal pressure, and means for exerting pressure on the glass contents of the mold, to compact the glass upon and around the said holding-heads.

4. A divided mold, consisting of verticallyswinging pivoted members, with means lor opening, closing and locking the mold, apertures in the ends of the mold when closed, a filling-aperture in the mold when closed, and a lid or cover, hinged to one member, and engaging the other member by a locking device.

5. A mold with open ends, holding-heads for plastic glass projecting into said open ends, collars on said holding-heads, closing the end apertures of the mold when the said heads are in place, thereby preventing the escape el plastic glass around the holding-heads, and means for applying endwise pressure upon the contents of the mold through said holding-heads and collars.

6. A divided mold having open ends and a filling-aperture, two rotatory holding-heads for plastic glass in axial alinement projecting into said open ends, collars on said holdingheads fitting and closing said open ends, means for closing and locking said mold and aperture when the mold is charged with plastic glass, and means for approximating said holding-heads upon the plastic charge, whereby the latter is caused to closely lill the mold and lit itself adhesively and securely upon and around the holding-heads.

7. Two rotatory holding-heads for plastic glass in axial alinement, means for casting a mass of plastic glass between and in secure adhesion to said holding-heads, whereby said glass may be rotated, a blocking device, lor marvering the rotating mass of glass, means for rotating said glass and holding-hezuls, and jointed connections securing said blocking device to the machine while admitting of the various movements required in blocking in cooperation with the rotating mass.

8. Two tubular rotatory holding-heads for plastic glass in axial alinement, means for casting a mass of plastic glass between and in secure adhesion to said holding-heads, whereby lOO said glass may be rotated, and a plunger "in axial alinement with therotatory mass of glass, constructed andadapted to be thrust central'lythrough said rotatory mass,l and into j the' opposite holding-head.

9. Two rotatory holding-heads for plasticl glassin axial alinement,I means for casting a mass ofplastic glass between and in secure adhesion to said holding-heads, whereby said glass may be'rotated, and means for rotating said holding-heads in unisonI in either'direction and inv each direction. 10. Two tubular rotatoryliolding-headsfor i plastic glass inaxial alinement, means for casting a mass of'plastic glass between and in se-l cure adhesion to said holding-heads, whereby said glass maybe rotated, means for introducing compressed air at regulated pressure to the interiori of said rotatory mass of glass through said holding-heads, and independent cut-off valves in the air-passages wherebythe air-current may besliut oif from'eitlier holding-head separately.

117. Two tubular rotatory holding-heads for plastic glass in axial alinement, means for casting a massof plastic glass between and in secure ladhesion to said holding-heads, whereby saidglassmay beV rotated, means for introducing compressed air at regulated pressure to the interior of said rotatory mass' of, glass through. said holding-heads, annular flanged washers surrounding. said holding-heads at a suitable distance, for forming necks on the ends of the glass article in process of` formation, and means for 'advancing'said washers over the ends of said holding-heads as the glass rotates, to form the necks, for the pur- .pose described.

vl2. A meansfor casting a-mass of plastic glass rotatively held at both ends, means for rotating said `plastic mass, means fo'r introducing compressed air within the plastic mass while rotating, at either end at will, an air- `pressure-regulating valve for controlling the degree ofpressure of the admitted air, and a hand-lever for manipulating said air-.regulating valve at the will of the operator.

13. l Two rotatory spindles horizontally placed in axial alinement, holding-headsfor plastic glass detachably held in said spindles, v

means for casting a mass of vplastic glass between and around said holding-heads, means one of said holding-heads for stopping thel terminalaperture thereof, a lock for'holding saidplug. to its seat in said holding-head, and

NIneans for passing air under regulated pressure through said tubular plug and holdinghead when thel plug is retracted. y

15.` -Tworotary holdingheads for plastic glass in axial alinement, means for castingfa mass .of plastic glass betweenand around said holding-heads, a'liollow movable plunger in one of said holding-heads, means for moving said plunger lengthwise through said holdingheadand intervening glass into the OPDOSite holding-head, means for stopping and unstopping the terminal aperture of said plunger at will from the -outside of the plunger, an'd-means forv passing air under regulated pressure through saidplunger.

16. A mainframe, a fixed head-stock'on Vsaid frame, a movabletail-stock on said frame, tu-y bularrotatory spindles held in bearings on said head-stock and tail-stock respectively, in

axial alinement, tubular holding-heads for plastic glass detachably held in said spindles,

means for. rotating said spindles and holding- .heads simultaneously in unisonin eitherdirection, means for passing air under vregulated pressure through said holding-heads whilein rotation, an open-ended mold betweensaid holding-heads, the openends oftwliich are,

closed by said holding-heads, andmeans for movingsaid tail-stock away from said 'headstock while'said holding-heads are in simultaneous rotation.

, 17. A mainframe, afixed headvstock on said frame, a movabletail-stock on said frame, rotatory' holding-heads foi` Iplastic glass held in axial alinement on said liead-stock and ,tailstock respectively, flanged neck-washers surrounding said holding-heads near the extremities thereof, with an intervening annular space,

IOO

movable pedestals with bearings supporting said neck-forming washers, means for'moving i said pedestalsrlengthwisef of the frame, and .means for locking one of'isaid pedestals to the finovabletail-stock at will. i

18.\ Two tubular rotatory holding-heads for plastic glass in axialalinernent, means for moving one of said holding-headstoward and from they other holding-head in, axial alinement,

TIO

means forfpassing compressed air to .and i through said holding-heads independently, means for cutting off the air-current from either of said holding-heads Aatwill, ahandoperated valve for regulatin'gfthe.pressureof theA air-current, land va check-valve between said regulating-valve andv the, holdingsheads, for holding the air against back. pressure.v f' 19. A mainframe, affixed head-stock on 'said frame, a tail-stock movable lengthwiseonsaid frame, a screw-shaft mounted lengthwise; on said'frame, anut on said vmovable tailstock in engagement with. said screw, a. means for operating said screw shaft, asplined shaft mounted lengthwise Von said frame, a means.;

for rotating said shaft, rotatoryk 4spindles mounted in'axialalineinent on said head-stock and tail-stock respectively, holding-,heads for unison when the shaft is rotated in either dilongitudinally within the holding-head to stop l nally fixed and the other longitudinally movplastic glass detachably held in said spindles. l in axial alinement, sprocket-gears on said s spindles for rotating the same, sprocket-gears on said splined shaft, one iixed and the other l movably splined thereon, and chain connections between said spindle-sprockets and the respective fixed and movable sprockets on the shaft, whereby said spindles are rotated in rection.

20. A main frame, a pedestal on said frame, a divided mold having its members pivoted by arms to said pedestal, means for opening, closing and locking said mold, the opposite ends of said mold being open when closed, rotatory holding-heads for plastic glass in axial alinement, projecting within said open ends, collars on said holding-heads fitting within and accurately closing the open ends of said mold, a filling-aperture for said mold, a pivoted locking-lid for said aperture, and means for exerting pressure upon the glass within the mold after the latter is filled and locked, whereby the glass is compressed and compacted 1 about the ends ofl the holding-heads, and caused to fill every portion of space in the mold.

2l. Two tubular rotatory holding-heads for plastic glass in axial alinement, one longitudinally fixed and the other movable, a hollow plunger within' the movable holdinghead, means for rotating said movable holding-head and plunger, means for moving said plunger lengthwise within the holding-head independently of' the latter, a sleeve revolubly held on the outer extremity ofthe plunger, means for holding the sleeve against rotation while the plunger rotates, a flexible conduit for air under pressure connected with said sleeve, and air-passages in said sleeve and plunger in communication, whereby compressed air may be sent through the plunger while rotating and when in longitudinal movement.

22. Two tubular rotary holding-heads for plastic glass in axial alinement, one longitudinally fixed and the other longitudinally movable, a hollow plug within the fixed holdinghead, means for rotating said fixed holdinghead and plug, means Jfor moving said plug and unstop the aperture thereof, a sleeve revolubly held near the outer extremity of' the plug, means for holding' the sleeve against rotation while the plug revolves, a iiexible conduit for air under pressure connected with said sleeve, and communication between said sleeve and plug, whereby compressed air is sent through the plug and holding-head while rotating, when the plug is in the retracted position.

28. Two tubular rotary holding-heads for plastic glass in axial alinement, one longitudiable, a hollow plunger within the movable holding-head, means for rotating said fixed hollow holding-head and plunger, means for moving said plunger lengthwise within the holding-head independently of' the latter, said plunger having a terminal aperture smaller than the bore of the plunger, a rod within the plunger,movablelengthwisethercinindependeutly of' the plunger and holding-head, an end piece secured on the outer end of the said rod by which the rod can be manipulated to stop or unstop the terminal aperture of the plunger, and a locking slot and pin, whereby the end piece and rod are held securely in either the stopped or the unstopped position.

24. A means for casting a mass of plastic glass rotatively held at both ends, means for rotating said plastic mass, means for expanding said mass by internal pressure while rotating, and a slicker, provided with means for securing longitudinal to-and-fromovement over the surface of' the rotating mass at graduated pressure applied by the hand oi the operator.

25. Amain frame, longitudinal ways thereon, a longitudinal shaft parallel with said ways, guide-blocks traversing on said shaft and ways, a slicker pivoted on said guideblocks, and a handle by which said slicker may be manipulated and pressure applied to the rotating glass article in process of formation.

26. A means for casting a mass of plastic glass rotatively held at both ends, lneans for rotating said plastic mass, meansfor expanding said plastic mass while rotating, a slicker, having a surface which is a segment of a cylinder, mounted beneath said rotating mass, means for traversing said slicker longitudinally to and fro beneath said rotating mass, and means for applying manual pressure to said slicker to -force it against the rotating mass.

27. The combination of' ways 1l, shaft 107, guide-blocks 105, pivoted slickcr 10?), and means whereby said slicler may be longitudinally moved to and fro, and pressure applied to the object under treatment.

28. Two tubular rotatory holding-heads for plastic glass in axial alinement, one fixed and the other longitudinally movable, means for casting amass of plastic glass between and around said holding-heads, means for rotating said holding-heads and glass in unison, a hollow movable rotatory plunger in said movable holding head, terminally aperturcd, means for moving said plunger lengthwise through its holding-head into and through the mass of' plastic glass, into the opposite holding-head, means Jfor stopping and unstopping the terminal aperture of' said plunger, means for passing air under regulated pressure through said plunger, a tubular movable rotatory plug in said fixed holding-head for stopping the terminal aperture thereof, means for moving said rotatory plug lengthwise in said holding-head independently of its rotation, and means for passing air under regu- IOO IIO

lated pressure through said plug, and fixed holding'- head', into the perforated mass'ot` plastic glass.` f

29'. Two tubular rotatory holding-heads for plastic glass, in axial alinement, means for casting a mass ofplastie glass betweenv and 1n' let in' said casing,two air-outlets -in said' cas-- ing, one leading to'tlie open air toeontrol pressure, and the other leading through pipes to the rotatory mass of gl'ass,a branched passage through said ValVe-plug leading by its branches respectively to said outlets, said open-air outlet being tapered to form avariable passage as the-plug is turned, and a handlever for operating the plug, by differential oi" pressure between the open-air outlet ofthe Valve and the glass-blowing outlet thereof.

the air-pressure within the expanding glass is regulated at will, substantially as specified.

In testimony whereof I have'signed my name to this specification in presence of two witnesses.

a Y IRViNG W. COLBURN.

`VVitnesseszy v FRED. D. OILER, IROBT. F. GLENN. 

